text: from selenium import webdriver
  from selenium.webdriver.common.keys import Keys
  import unittest
  
  class NewVisitorTest(unittest.TestCase):
  
      def setUp(self):
          self.browser = webdriver.Firefox()
          self.browser.implicitly_wait(3)
  
      def tearDown(self):
          self.browser.quit()
  
      def test_can_start_a_list_and_retrieve_it_later(self):
          # Edith has heard about a cool new online to-do app. She goes
          # to check out its homepage
          self.browser.get('http://localhost:8000')
  
          # She notices the page title and header mention to-do lists
          self.assertIn('To-Do', self.browser.title)
          header_text = self.browser.find_element_by_tag_name('h1').text
          self.assertIn('To-Do', header_text)
  
          # She is invited to enter a to-do item straight away
          inputbox = self.browser.find_element_by_id('id_new_item')
          self.assertEqual(
                  inputbox.get_attribute('placeholder'),
                  'Enter a to-do item'
          )
  
          # She types "Buy peacock feathers" into a text box (Edith's hobby
          # is tying fly-fishing lures)
          inputbox.send_keys('Buy peacock feathers')
  
          # When she hits enter, the page updates, and now the page lists
          # "1: Buy peacock feathers" as an item in a to-do list table
          inputbox.send_keys(Keys.ENTER)
  
          table = self.browser.find_element_by_id('id_list_table')
          rows = table.find_elements_by_tag_name('tr')
          self.assertTrue(
              any(row.text == '1: Buy peacock feathers' for row in rows)
          )
  
          # There is still a text box inviting her to add another item. She
          # enters "Use peacock feathers to make a fly" (Edith is very
          # methodical)
          self.fail('Finish the test!')
  
          # The page updates again, and now shows both items on her list
  
         # Edith wonders whether the site will remember her list. Then she sees
         # that the site has generated a unique URL for her -- there is some
         # explanatory text to that effect.
  
         # She visits that URL - her to-do list is still there.
  
         # Satisfied, she goes back to sleep
  
  if __name__ == '__main__':  #7
      unittest.main(warnings='ignore')  #8